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MCQs

Total Questions : 448 | Page 41 of 45 pages
Question 401. . Heat flows from one body to other when they have
  1.    Different heat contents
  2.    Different specific heat
  3.    Different atomic structure
  4.    Different temperatures
 Discuss Question
Answer: Option D. -> Different temperatures
Question 402. . The concept of overall coefficient of heat transfer is used in heat transfer problems of
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Conduction and convection
 Discuss Question
Answer: Option D. -> Conduction and convection
Question 403. . The amount of heat flow through a body by conduction is
  1.    Directly proportional to the surface area of the body
  2.    Dependent upon the material of the body
  3.    Inversely proportional to the thickness of the body
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 404. . Total emissivity of polished silver compared to black body is
  1.    Same
  2.    Higher
  3.    More or less same
  4.    Very much lower
 Discuss Question
Answer: Option D. -> Very much lower
Question 405. . Which of the following has least value of conductivity
  1.    Glass
  2.    Air
  3.    Plastic
  4.    Rubber
 Discuss Question
Answer: Option B. -> Air
Question 406. . Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by
  1.    Convection
  2.    Free convection
  3.    Forced convection
  4.    Radiation
 Discuss Question
Answer: Option D. -> Radiation
Question 407. . Depending on the radiating properties, body will be transparent when
  1.    ρ = 0, τ = 0 and α = 1
  2.    ρ = 1, τ = 0 and α = 0
  3.    ρ = 0, τ = 1 and α = 0
  4.    τ = 0, α+ρ = 1
 Discuss Question
Answer: Option C. -> ρ = 0, τ = 1 and α = 0
Question 408. . The concept of overall coefficient of heat transfer is used in case of heat transfer by
  1.    Conduction
  2.    Convection
  3.    Radiation
  4.    Conduction and convection
 Discuss Question
Answer: Option D. -> Conduction and convection
Question 409. . Thermal conductivity of glass-wool varies from sample to sample because of variation in
  1.    Composition
  2.    Porosity
  3.    Structure
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 410. . Which of the following has maximum value of thermal conductivity
  1.    Aluminium
  2.    Steel
  3.    Brass
  4.    Copper
 Discuss Question
Answer: Option A. -> Aluminium

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